228720253 has 4 divisors (see below), whose sum is σ = 228750940. Its totient is φ = 228689568.

The previous prime is 228720241. The next prime is 228720307. The reversal of 228720253 is 352027822.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 352027822 = 2 ⋅176013911.

It can be written as a sum of positive squares in 2 ways, for example, as 129458884 + 99261369 = 11378^2 + 9963^2 .

It is a cyclic number.

It is not a de Polignac number, because 228720253 - 2⁹ = 228719741 is a prime.

It is the 15124-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228720553) by changing a digit.

It is a nontrivial repunit in base 15123.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3793 + ... + 21721.

It is an arithmetic number, because the mean of its divisors is an integer number (57187735).

Almost surely, 2^228720253 is an apocalyptic number.

It is an amenable number.

228720253 is a deficient number, since it is larger than the sum of its proper divisors (30687).

228720253 is a wasteful number, since it uses less digits than its factorization.

228720253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30686.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 228720253 is about 15123.5000247958. The cubic root of 228720253 is about 611.5540889050.

The spelling of 228720253 in words is "two hundred twenty-eight million, seven hundred twenty thousand, two hundred fifty-three".